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Summary
Submitted by Durandal on 17 August 2021
If using an userport WiFi modem, make sure it uses the Zimodem firmware (or other firmware with hardware flow control support) and has at least the RTS line connected.
Set up your modem accordingly, ie with ZiModem firmware:
ATB57600 to change baud rate to 57600
ATF0 to enable RTS/CTS flow control
ATS51=n if needed, where n is the RTS pin number, this is specific to your modem |
Summary
Submitted by Durandal on 16 August 2021
At its core, Retroterm is a barebones CG terminal working exclusively at 57600bps, but normally receiving up to 3 characters per frame, resulting in an effective data rate of 1500bps on PAL or 1800bps on NTSC.
What makes Retroterm special is the implementation of a simple protocol we call Turbo56K, which, in conjunction with a compatible BBS software allows full 57600bps throughput by disabling the screen at the right time.
With this protocol, it is possible to stream 11KHz PCM audio to the SID chip, or quickly transfer files or bitmap graphics to memory.
Another command permits the streaming of 1x .sid music.
Please watch the videos at http://www.pastbytes.com/retroterm/index.html to see examples of an earlier version.
Included in the archive are:
* retroterm-u.prg: The main terminal, bitbanging at 57600bps thru the userport
* retroterm-232.prg: A Turbo232 version of the terminal, for testing in VICE, it has not been tested on real hardware.
* retroterm-232.prg: A SwiftLink version of the terminal, for testing in VICE/Ultimate II/U64, it has not been tested on real hardware |
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